Ejemplo acceso a web api

<script>

    fetch("https://localhost:44339/api/Alumnoes").then(resp => resp.json())
        .then(data => {
            for (alumno of data) {
                console.log(alumno.id + "-" + alumno.nombre + "-" + alumno.nota);
            }
        })

    let alumno = { nombre: "Firulai", nota: 8 };
    let params = {
        method: 'POST',
        body: JSON.stringify(alumno),
        headers: {
            "Content-type": "application/json; charset=UTF-8"
        }
    };
    fetch('https://localhost:44339/api/Alumnoes', params)
        .then(response => response.json())
        .then(json => console.log(json))

    alumno = { id: 9, nombre: "Firulai", nota: 6 };
    params = {
        method: 'PUT',
        body: JSON.stringify(alumno),
        headers: {
            "Content-type": "application/json; charset=UTF-8"
        }
    };
    fetch('https://localhost:44339/api/Alumnoes/9', params)
        .then(response => response.json())
        .then(json => console.log(json))
        .catch(error => console.log(error));

    params = {
        method: 'DELETE',
        headers: {
            "Content-type": "application/json; charset=UTF-8"
        }
    };
    fetch('https://localhost:44339/api/Alumnoes/13', params)
        .then(response => response.json())
        .then(json => console.log(json))
        .catch(error => console.log(error));
</script>